Currently browsing posts about: Dietary-Guidelines

I received an e-mail from the communications director of the Independent Women’s Forum, a group whose mission is to “improve the lives of Americans by increasing the number of women who value free markets and personal liberty.”

Among our most acute concerns is the “mission creep” of the Committee, which has expanded to include non-dietary factors such as “carbon footprints,” “climate change,” “urban agriculture,” and “green cleaning and pest control practices.”

This likely reflects the composition of the Committee, which is nearly all epidemiologists from elite academic institutions with no direct experience in the practical realities of how food is produced and what average Americans may choose to eat.

We need only consider the strongly negative reaction to recent changes to the school lunch rules to understand what is at risk if this Committee attempts to dictate over-reaching changes to the American diet.

This would be funny if it weren’t part of the Republican agenda to roll back improvements in nutrition advice and practice aimed at preventing obesity and its related chronic diseases.

Mal Nesheim and I have an editorial in a recent issue of the American Journal of Clinical Nutrition: “Advice for fish consumption: challenging dilemmas.”

We commented on a research article evaluating blood mercury levels in adults eating seafood.

In it, we point out that

the 2010 Dietary Guidelines for Americans advise Americans to consume 8 ounces (227 g) of seafood per week to reach an average intake of 250 mg/d of the omega-3 fatty acids EPA and DHA.

This recommendation represents a substantial increase over current consumption amounts of ∼3.5 oz/wk. It is based on “moderate, consistent evidence” that the health benefits of increased seafood consumption outweigh the risks associated with methylmercury, a toxic contaminant of large predatory food fish (tilefish, shark, swordfish, king mackerel) and, to a lesser extent, albacore (white) tuna.

To avoid this toxin, the guidelines advise eating seafood typically found to be low in methylmercury, such as salmon, anchovies, sardines, and trout.

Such advice, however, leads to at least 3 dilemmas. Eating more fish might raise methylmercury intake above safe amounts. Pressures to consume more fish might place impossible demands on an already threatened seafood supply. And the obvious solution—fish farming—raises concerns about what farmed fish are fed and how farmed fish affects the environment.

We urge the 2015 Dietary Guidelines committee to take all this into consideration when making recommendations about fish consumption: “We hope that its advice for seafood consumption will help a confused public resolve some of these dilemmas and make wise seafood choices.”

The process: Two federal departments, USDA and Health and Human Services, appoint an advisory committee of nutrition scientists. The committee reviews the science and prepares a report. Since 2005, the agencies have written the guidelines, not the committee.

Disclosure: I was a member of the advisory committee for the 1995 Guidelines.

Its story particularly singled out Miriam Nelson, a professor at Tufts (not New York University—could Fox be confusing her with me?):

New York University professor Miriam Nelson, said at the committee’s last meeting, “We need to make sure that the guidelines and the policies are promoting those foods … [that] are sustainably grown and have the littlest impact on the environment.”

…The professors of the DGAC may think their job is save the planet by promoting sustainable agriculture and plant-based diets, but if they don’t understand the real-world implications of their work, they’ll be oblivious to the havoc they’ll wreak on the millions of Americans whose diets hinge on their guidelines.

By this time, the Dietary Guidelines are hardly of interest to anyone but policy wonks (really, they never change all that much). Cheers to the current committee for injecting some life into them.

Current evidence does not clearly support cardiovascular guidelines that encourage high consumption of polyunsaturated fatty acids and low consumption of total saturated fats.

This meta-analysis follows an editorial in a Mayo Clinic publication (http://dx.doi.org/10.1016/j.mayocp.2013.11.006) by authors who argue that saturated fat is not the problem. Carbohydrates (e.g., sugars) are the problem. The authors argue:

Effects of saturated fat on blood cholesterol are weak and transient.

Meta-analyses have found a lack of an association between heart disease mortality and saturated fat intake.

Stroke studies find that patients with stroke had eaten less saturated fat.

Long-term studies find that people with the highest dairy consumption have the lowest mortality risk, and also low diabetes and heart disease.

Dietary trials find trivial or no benefit at all from decreasing saturated fat and/or increasing intake of polyunsaturated fat.

On this basis, they say that advice to reduce intake of saturated fat is irrational.

The New York Times asked several experts for comment on the meta-analysis, among them Dr. Frank Hu of Harvard:

The single macronutrient approach is outdated…I think future dietary guidelines will put more and more emphasis on real food rather than giving an absolute upper limit or cutoff point for certain macronutrients…people should try to eat foods that are typical of the Mediterranean diet, like nuts, fish, avocado, high-fiber grains and olive oil.

Dr. Hu was referring to a large clinical trial (not included in the meta-analysis), which concluded that a diet with more nuts and extra virgin olive oil reduced heart attacks and strokes when compared with a lower fat diet with more starches.

The Times story contained a reminder that the American Heart Association issued dietary guidelines last year to “restrict saturated fat to as little as 5 percent of their daily calories, or roughly two tablespoons of butter or two ounces of Cheddar cheese for the typical person eating about 2,000 calories a day.”

How to make sense of this?

I vote with Frank Hu that dietary advice should focus on food, not nutrients.

Focusing on one or another nutrient—fat, saturated fat, cholesterol, or sugar—takes foods out of their caloric as well as dietary context.

My guess: If you balance food intake with physical activity and are not overeating, the specific proportion of fat, carbohydrate, and protein won’t matter nearly as much.

While the arguments about fat v. sugar go on and on: Eat your veggies, vary the foods you eat, don’t gorge, and enjoy what you eat.

Brazilian health officials designed the guidelines to help protect against undernutrition, which is already declining sharply in Brazil, but also to prevent the health consequences of overweight and obesity, which are sharply increasing in that country.

The guidelines are remarkable in that they are based on foods that Brazilians of all social classes eat every day, and consider the social, cultural, economic and environmental implications of food choices.

The guide’s three “golden rules:”

Make foods and freshly prepared dishes and meals the basis of your diet.

Be sure oils, fats, sugar and salt are used in moderation in culinary preparations.

Limit the intake of ready-to-consume products and avoid those that are ultra-processed.

The ten Brazilian guidelines:

Prepare meals from staple and fresh foods.

Use oils, fats, sugar and salt in moderation.

Limit consumption of ready-to-consume food and drink products

Eat regular meals, paying attention, and in appropriate environments.

Eat in company whenever possible.

Buy food at places that offer varieties of fresh foods. Avoid those that mainly sell products ready for consumption.

Would you like us to have sensible, unambiguous food-based guidelines like these? You can file comments on the 2015 Dietary Guidelines here.

Thanks to Professor Carlos A. Monteiro of the Department of Nutrition, School of Public Health at the University of Sao Paulo for sending the guidelines and for their translation, and for his contribution to them.

Since 1980, U.S. dietary guidelines have advised eating less sodium (salt is 40% sodium, 60% chloride). Although sodium is an essential nutrient, most Americans consume way more than they need or is good for them—around 3,400 milligrams a day.

The 2010 guidelines advised healthy people to consume no more than 2,300 mg per day (~6 grams, or 1.5 teaspoons). They advised even less, 1,500 mg, for people with or at high risk for high blood pressure. Since blood pressure increases with age in countries with high salt intake, this applies or will apply to just about everyone.

Why anyone would think that nutrition education alone would change behavior is beyond me. By this time everyone should know that to change behavior requires not only education, but a food environment—social, political, economic—that supports and promotes the behavior change.

Most dietary sodium comes from processed foods, restaurant foods, and other pre-prepared foods. All the label can do is say ‘don’t eat me’ It can’t help with what people can eat.

The easiest and most effective way to help people reduce sodium intake is to require food producers and food preparers to use less of it. Good luck with that. I’m not optimistic, particularly given the conflicting and confusing science.

Ah yes. The conflicting science. The IOM now says that there’s no evidence one way or the other that reducing sodium below 2,300 mg per day, or even to 1,500 per day, does much good, and that low sodium intakes could be harmful (but this too is controversial).

It may be true that there are no benefits in an ultra-low-salt diet, but almost no one is eating an ultra-low-salt diet. It’s not quite like worrying about whether we get “enough” sugar, but it’s nearly as ridiculous.

And now, as Food Navigator explains, the IOM committee is complaining that its report has been badly misinterpreted. All they said was:

As to whether we should cut back to 1,500 mg or to 2,300 mg sodium a day, meanwhile, the jury is out, says the IOM, not because consuming 1500 mg/day is dangerous, but because there is just not enough data on the benefits of consuming such low levels to support a firm conclusion.

IOM committee members were so bothered by misleading press accounts that they wrote an op-ed to JAMA to clarify:

Rather than focusing on disagreements about specific targets that currently affect less than 10% of the US population (ie, sodium intake of <2300 mg/d vs <1500 mg/d), the IOM, AHA, WHO, and DGA are congruent in suggesting that excess sodium intake should be reduced, and this is likely to have significant public health effects. Accomplishing such a reduction will require efforts to decrease sodium in the food environment….

The bottom line, Bittman says (and I enthusiastically agree), is that

Salt intake — like weight, and body mass index — is a convenient baseline for public policy people to talk about. If you focus on eating less salt — and, indeed, less sugar — you will inevitably eat less processed food, fast food, junk food (it’s all the same thing.) If you eat less processed food (etc.) you eat more real food. If you eat more real food, not only are you healthier, but you probably don’t have to pay attention to how much salt you’re eating. Wowie zowie.

His accomplishments as a Senator and statesmen were legion, many of them strongly connected to food politics.

As I mentioned in 2009 when I gave the state department’s annual George McGovern lecture in Rome, he chaired the Senate Select Committee on Nutrition and Human Needs from 1968-1977. This committee greatly expanded food assistance programs and then developed the first federal guidelines for chronic disease prevention: Dietary Goals for the U.S.

In Food Politics, I described the work of this strongly bipartisan committee (Bob Dole was its lead Republican member) and how it did so much to improve the lives of women and children living in poverty in the United States, and of poor people throughout the world.

The committee also broke new ground in shifting nutrition education from a focus on eating more of a variety of foods to eating less of foods that increased risks for chronic disease.

What’s shown here is the February 1977 version of this landmark report. As the result of outraged protests by food producers affected by the “eat less” messages, the committee was forced to tone down its recommendations. The committee issued a revised report in December that year.

That was the committee’s final act. Congress disbanded it and McGovern lost his bid for reelection.

McGovern leaves an extraordinary legacy, one unimaginable in this era of partisan politics.

He was far ahead of his time, as this 1977 photo shows. It is a fitting tribute.